Lithium batteries and new solar charger
I am replacing my 4 6V batteries I think 2 lithium, have never been impressed by the 30A PWM charger for my 600W solar, probably my fault for using 8 avg wire on a 9m run. Thinking if I get a Victron ...
Forum Discussion
BFL13 wrote:
With the usual tables for SOC/voltage , they are the same no matter what the battery capacity size is.
If the LFP table is the same way, then how can you tell if your actual 100AH batt is at 15% by its voltage compared with the 120AH battery at 15% when they are calling that zero SOC at 10v?
you wont know the exact size of the battery unless you do a capacity test on it and see how many amp hours it puts out before it shuts off. but that only works if they let you go that low with the setting in the BMS so that test is usaly only done when people build them and set there own peramiters in the BMS, with a comercial you do it and if you get 100 amps on a 100 amp battery your happy and thats it.. depending on there setting maybe you will get more AH, but I know if I was building a unit comercialy I would use a 120 or 130 capacity cells to make a 100AH batter then set up the BMS so you can use 102AH with the 120 cells and 110Ah on the 130 cells.
as for knowing when your at 15, you wont , well but you will , with a voltage only you should be at 12.9V @ 20%, 12.8V @ 17%, 12.6V at 15%, when it drops to 12.5V you are at 14%. so that will tell you percentage used but the only way you can tell AH use is if the BMS has a bluetooth conection to an app, or you buy a simeple Battery montor that supports LI
Steve
